The maker points on the 4.5 hp Mercury outboard, are set at 0.020 in.
The correct spark plug gap for the 1982 model, 9.8 hp Mercury outboard is .040 in.
The points gap on a Merc 40 4hp is .020
The magneto point gap on a 2hp Yamaha outboard is 0.35mm, or 0.014".
A Mercury outboard will run well with a plug gap of .035 - .040 in.
The point gap for the 50 hp Johnson outboard is set at .020".
The 25 hp Johnson outboard runs a plug gap of .030 in.
The plug gap for a 1995 model, 85 hp Suzuki outboard is .039 in.
The recommended plug gap for the 1993 model, 3hp Evinrude outboard is .030 in.
The spark plug gap for a 2003 Mercury 125hp outboard motor is .040"
The plug gap for a 9.9hp Mercury outboard, ( all models ), is .035 - .040in.
The recommended gap is .025"